Single-dial control for radio receiving apparatus



Jan. 17, 1928. 1,656,442

- L. MANDEL SINGLE DIAL CONTROL FOR RADIO RECEIVING APPARATUS Filed Dec.'7, 1925 2 Sheets-Sheet 1 WE Q Jam 17, 1928:, I LR ESGALZ L. MANUELSINGLE DIAL CONTROL FOR RADIO RECEIVING APPARATUS Filed D80. '7, 1925 2Sh Patented Jan. 17, 1928.

UNITED STATES ATENT OFFICE,

LOUIS imnnnn, or crrroaeo, ILL-mole.

SINGLE-DIAL CONTROL FOB, RADIO RECEIVING APPARATUS.

Application med December This invention relates to improvements inmechanism for controlling the condensers of controlled.

In apparatus of this character and whencontrolling a plurality ofcondensers, generally three in number, although the condensers are ofuniform inductance capacity, it has been found that there will always bea slight variation at various points of their inductance capacity.

Heretofore and in order to overcome this objection and difliculty, threeseparate controls have been provided, in a measure, for each of thevariable condensers.

It is one of the objects of the present 1nvention to provide improvedmeans embody ing a single operating device for actuating all of therotors of the condensers until the desired capacity or wave length hasbeen reached, and also means whereby certain of the stators may be givena free or independent movement or adjustment until all of the condensersare in perfect synchromsm with each other.

A further'object is to provide improved means of this character whichwill be of a simple and compact arrangement and which will be Vernier inaction. v

To the attainment of these ends and the accomplishment of other new anduseful objects as will appear, the invention consists in the features ofnovelty in substantially the construction, combination and arrange- Vment of the several parts hereinafter more fully described-and claimedand shown in the accompanying drawings illustrating this invention, andin which Figure .1 is a top plan view of an apparatus of this characterconstructed in accordance with the principles of this invention.

Figure 2 is a front elevation of Figure 1.

Figure 3 is a' detail sectional view taken on line 3-3, Figure 2.

Figure 4 is a detail sectional view taken on line 4- -4, Figure 1. Inthe drawings three condensers A, B and C are shown, the condenser Bbeing the central condenser and the condensers A and C the outermostcondensers, all of which condensers are variable and are Vernier inaction. Y

These condensers are of the ordinary and 7, 1925. Serial No. 73,676.

well known type embodying a stator and a rotor.

In the middle condenser B the stator, designated generally by thereference numeral 10 is stationary and ismounted in the usual manner,and co-operatmg with the stator 10 is a rotor 11 having the usual bladeson plates which co-operate with the plates or vblades of the stator. I l

The hub 12 of the rotor 11 has connected with it a stub shaft 13projecting beyond one end thereof and a stub shaft 14 projecting beyondthe other end thereof. The shaft 14 'is journaled in a suitable bearing15 and the shaft 13lS connected by means of a suitable coupling member16 with the shaft 17 that is journaled in a suitable bearing 18.Connected with the coupling member 16 is a dial or indicator 19 which isprovided with characters or designations 20 indicating different wavelengths or different stations.

The coupling member 16 is secured to the shafts'13 and 17 in anysuitable manner such as by means of .suitablc fastening devices 2122 sothat the-shafts and coupling member will rotate in'unison.

tension device of any suitable constructron, preferably embodying aspring member 23 is provided, which is preferably'of a slightly concaveconstruction, the periphery or extremity of which contacts with the endmember 24 of the stator 10. The shaft 13 passes throu 'hthis member 23and a nut or collar 25 is threaded upon the end of the shaft 13 and isadapted to be seated in a recessedport-ion 26 in the tension device 23.

so that by adjusting the collar 25 suitable friction will be maintainedagainst the end of the hub 12 of the rotor 11 and thereby provide thenecessary friction for assisting in maintaining the parts in position.

The rotor 11,is adapted to be adjusted preferably by means of a wormgear 27 secured to the shaft Y7, and a worm 28 meshes with the wormgear.This worm is connected with a shaft 29 having a handle ortation with therotor 11, and this is accomplished by reason of the fact that the shaft17 of the condenser C is connected with the coupling 16, and a similarshaft 31 of the condenser A is connected by means of a coupling 32 withthe shaft 14 of the rotor 11 of the condenser B, the shaft 31 beingjournaled in a suitable bearing 31. s

The construction of each of the condensers A and C is substantially thesame and therefore the specific description of one will apply equally aswell to them both.

The rotor of the condenser C embodies-a A hub 33 to which the blades 34are connected,

and the stator 35 is provided with end members 364-37. The shaft 17which is connected with the hub 33 passes loosely through the end member36 and a bearing 38 is formed about the opening in the end member 36,through which the shaft passes. A bearing member 39 is connected withthe shaft 17 preferably by being threaded thereupon and this bearingmember 39 co-operates with the bearing 38 in the end member 36 of thestator and is held in position against accidental displacementpreferably by means of the fastening device 40, in the form of a screwor the like.

Passing loosely through the end member '37 of the stator is a screw orbolt member 41, the head of which rests against the outer face of themember 37, and the body element 41 is preferably threaded into the endof the hub 33. A tension member 42 provided with anopen seat 43encompasses the shank 'of the element 41 and contacts with the endmember 37, the body of the tension member 42 being shaped so that itwill be s acedfrom the end member. A nut or col ar 44 is threaded u onthe shank of the element 41 and is seate' within the recess 43 of theelement 42, and also contacts with the end of the hub 33 of the rotor sothat by adjusting the nut or collar 44 with respect to the element 41the bearing member 39 will be held against thebearing 38 in the endmember 36 and suflicienttension orfriction will be created between theseparts so as to hold the stator and also the rotor in theirrespectiveadjusted positions relative to each other. A

With this construction it will be manifest that the rotor is adapted fora relative roadjustment with respect to the stator will always be aslight variation at various points in their inductance capacity andtherefore in order to control this variation in inductance means areprovided whereby the stators of the outermost condensers A. and C mayalso be adjusted with relation to the rotors of the respectivecondensers, and

independently one withrespect to the other and also with respect to thecondenser B.

Inasmuch as the stators of the condensers A and C are mounted forpivotal or rotary adjustment, independently with relation to therespective rotors, any suitable means may be provided for securing, suchan adjustment and which adjusting means will be Vernier in action. 3

To that end there is provided an adjusting device embodying a handle 45which may be of any desired configuration but is preferably of a yokelike formation, the arms 46- 47 ofwhich are re actively pivoted to sup--ports 48-49. The andle 45 is arranged in any convenient position for theoperator.

Projecting from the arm 47 is a pin 50 which extends into a bifurcation51 of abracket 52, the latter being supported upon the stator in anysuitable manner preferably by forming upon the end member 36 of the Istator abracket 53 which is shaped to form a v bearing 54 for'the endmember and which bearin 54"co-operates with the'bearing 18 to receive asleeve or collar 55 in which the shaft 17 is directly journaled- Thissleeve or collar '55 is preferabl threaded in the bearings 18 and 54 andas ahead ,56 between which head and the adjacent face of the bearing 18a. spring device 57 is arranged so as to hold the sleeveor collar 55 inits,

adjusted position with respect to the bear- 'ings 1854, and which spring57 operates as a locking means for preventing accidental displacement oradjustment of the sleeve or collar 55 and at the same time holds thestator plate against being rotated by friction when the rotor plates arebeing rotated.

It will be noted that the stator 35 is pivotally mounted upon the shaft'17 and the pivots 58 and 59of the arms 46- 47 of the lever 45 areoffset with respect to each other, thereby increasingthe leverage andproviding for a Vernier adjustment of the stator.

The spring member 42 also serves as a means for holding the stator inits adjusted position with respect to the rotor.

The jaws of the bifurcation 51 are of a more or less spring constructionso that the jaws will compensate or take up any lost motion betweenthese parts.

The stator of the condenser A as well as I the 'rotorare rotatable andindependently adjustable in the same manner as the stator and rotor ofthe condenser C.

7 With this improved construction it will be manifest that when it isdesired to tune in,-the handle or knob 30 is operated so as tosimultaneousl adjust the rotors of all three of the con ensers andshould there be any slight variation of the condensers at all that isnecessary is to adjust the handle 45 of either one or both of theoutside condensers A and C in which the variation occurs until the threevariable condensers are in perfect synchronism with each other, and asthe lever action of the handles or adjusting devices 45 of thecondensers A and C are vernier in action it will be manifest that anaccurate adjustment of the outside condensers one with respect to theother and also with respect to the condenser B may be readily obtained.

Obviously many changes may be made in the details of construction and inthegombination and arrangement of the several parts, within the sco e ofthe claims, without departing from t e spirit of this invention.

What is claimed as new is 1. In combination, a plurality of condensers,each embodying a stator and a rotor, means operatively connecting therotors for simultaneous adjustment, the stator of one of said condensersbeing mounted for pivotal movement independently with respect to itsrotor, a lever device for moving the stator about its pivot, the pivotsof said lever and stator being ofiset with respect to each other, and anoperative connection between the lever and stator. v

2. In combination, a plurality of condensers, each embodying a statorand a rotor, means operatively connecting the rotors for simultaneousadjustment, the stator of one of said condensers being mounted forpivotal movement independently with respect to its rotor, a pivotallymounted actuating device, the pivot of said "actuating device and thesaid stator being offset'one with respect to the other, and a pin andslot connection between the lever anclthe stator.

3. A condenser embodying a stator and a rotor, said rotor embodying ahub like portion, means mounting the stator upon said hub like portionfor pivotal movement with respect to the rotor, means for controllingthe rotor, separate means for effecting a vernier adjustment of thestator with respect to the rotor, the last recited means including alever mounted upon a separate pivot, and an operative connection betweenthe lever and the stator.

"' 4. A condenser embodying a stator and a rotor, said rotor embodying ahub like por tion, means mounting the stator upon said hub like portionfor pivotal movement with respect to the rotor, means for controllingthe .rotor, a lever mounted upon a pivot separate froin and offset withrespect to the pivot of the stator, and a pin and slot con nectionbetween the lever and stator whereby said lever will be vernier inaction.

5. A condenser embod mg a rotor, said rotor embodying a hub 1i eportion, a stator pivotally mounted upon said hub, a bearing interposedbetween the stator and rotor, means tending normally to hold the partsof the bearing in cooperative relation, means for controlling the rotor,and means for imparting a vernier adjustment to the stator with relationto the rotor.

6. A condenser embod ing a rotor, said rotor embodying a hub liliieportion, a stator pivotally mounted upon said hub, means for controllingthe rotor, means for effecting a vernier adjustment of the stator withrespect to the rotor, and friction creating means individual to therotor and the stator and against the respective stresses of which lastsaid means the stator and rotor are adjust- ,able.

embodying a plurality of condensers, a

single shaft for the condensers, means for rotating the shaft, pivotallymounted actuating levers individual to certain rotatably mounted statorframes, and means forming connections between the levers and therespective adjacent stator frames, said levers being movable on pivotstransverse to the axis of the stator to which it is connected.

9. A device of the character described embodying a plurality ofcondensers, a single shaft for the condensers, means for rotating theshaft, pivotally mounted actuating levers individual to certainrotatably mounted stator frames, and a pin and slot connection betweenthe levers and the respective adjacent stator frames.

10. A device of the character described embodying a plurality ofcondensers, a

single shaft for the condensers, a turning knob for rotating the shafts,stator frames rotatably mountedupon said shaft, members mounted formovement on'pivot-s transverse to the axisof theshaft, and connectionsbetween the said'members and-the respective adjacent "stator frames forrotating the latter.

In testimony whereof-I have. signed in name to this s ecification, onthis 19th day of November, D. 1925.

. ,Loms MANDEL.

